ML17305B004

Reviews Util Providing Evaluation of Results of Gas Binding on Charging Pump Operability

ML17305B004
Person / Time
Site:	Palo Verde
Issue date:	08/16/1990
From:	Peterson S Office of Nuclear Reactor Regulation
To:	Conway W ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
References
TAC-68073, TAC-68074, TAC-68075, NUDOCS 9008230096
Download: ML17305B004 (4)

Text

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t Docket Nos. 50-528, 50-529 and 50-530 August 16, 1990 Mr. William F.

Conway Executive Vice President Arizona Public Service Company Post Office Box 52034 Phoenix, Arizona 85072-2034

SUBJECT:

CHARGING PUMP OPERABILITY (TAC NOS. 68073, 68074 AND 68075)

By letter dated March 2, 1988, Arizona Nuclear Power Project (ANPP) provided the results of an evaluation. of the effects of gas binding on an operating charging pump which has a pre-existing cracked block.

The evaluation concluded that such a

pump would be capable of delivering its required flow following a gas binding event.

The evaluation also concluded that the rate of crack growth was sufficiently slow so as to justify deletion of ANPP's commitment to declare a charging pump inoperable within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> of thru-wall crack discovery..

NRC approval was sought for this deletion.

Based upon the operating experience of the Palo Verde charging pumps to date with the installation of a new block design and the availability of spare

blocks, we conclude that any proposed relaxation of your commitment would more appropriately be evaluated on a case-by-case basis rather than granting anticipatory approval for a spectrum of circumstances.

If you have any questions on this matter, please contact me.

S in cere ly, cc:

See next page Original signed by Sheri R. Peterson Sheri R. Peterson, Project Manager Project Directorate V

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Mr. William F.

Conway Arizona Public Service Company Palo Verde CC:

Arthur C. Gehr, Esq.

Snell E Wilmer 3100 Valley Center Phoenix, Arizona 85073 Charles R. Kocher, Esq. Assistant Council James A. Boeletto, Esq.

Southern California Edison Company P. 0.

Box 800

Rosemead, California 91770 Senior Resident Inspector U.S.

Nucl'ear Regulatory Commission HC-03 Box 293-NR Buckeye, Arizona 85326 Regional Administrator, Region V

U. S. Nuclear Regulatory Commission 1450 Maria Lane Suite 210 Walnut Creek, Cali.fornia 94596 Mr. Charles B. Brinkman Washington Nuclear Operations Combustion Engineering, Inc.

12300 Twinbrook Parkway, Suite 330 Rockville, Maryland 20852 Mr. Charles Tedford, Director Arizona Radiation Regulatory Agency 48l4 South 40 Street Phoenix, Arizona 85040 Chairman Maricopa County Board of Supervisors ill South Third Avenue Phoenix, Arizona 85003 Mr. Jack R.

Newman Newman 5 Holtzinger P.C.

1615 L Street,

'NW, Suite 1000 Washington, DC 20036

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